System Administration Guide
Chapter 3, Backing up filesystems

Rotating and archiving backup media

Rotating and archiving backup media

You should retain backups so that you have between 6 and 12 months of media on file. The typical media rotation times are: 

 Backup level   Save for
 2              3 weeks
 1              4 months
 0 (Complete)   1 year
This means that if you follow this schedule, you can safely reuse your Level 2 backup media after 3 weeks.

You should periodically archive your filesystem backups offsite. In the event of a fire or other catastrophe, you can use these offsite backups to restore your data.

See also: